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Reported herein are the results of an analysis of the compatibility of three methods for quantifying the non-adsorbed forms of reactive dyes, in an exhausted dyebath, of the type monochlorotriazine ⁄ b-sulphatoethylsulphone used in dyeing cellulosic fibres (cotton). The first method is based on spectrophotometric analysis and involves measuring the absorbance of the residual dyebath (after the dyeing process), the second is based on colorimetric analysis and involves measuring the reflectance of the dyed fabric and the third is based on high-performance liquid chromatography. The purpose of the latter is to identify and quantify the non-adsorbed dye forms in the residual dyebath. The calculated exhaustion values unequivocally prove the reliability and compatibility of these methods.

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